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  1. Offroader

    Qulbix 76 with 3KWH battery for sale

    I'm putting up for sale a Qulbix 76. I'm not yet sure if I should part it out or sell the complete bike. I'll take reasonable offers for parts of the bike or the complete bike. Bike is located in New York City. Please make offers for the frame or battery, or any parts as I will probably wind...
  2. Offroader

    Careful when buying KTY-84 temp sensors

    Lots of bikes use the KTY-84 sensors, and that is probably because they are rated for very high temperatures. Your typical NTC 10K thermistors are rated for -55 to 125C. We know ebikes can easily go above 125C. A real KTY 84 will work up to 300C. The KTY-84 sensors have been discontinued. But...
  3. Offroader

    Did this guy deserve my footpeg through his car door?

    I got in to a small accident and while it may seem I am at fault, I feel that he should have taken the turn slower and looked before turning. I was riding in a somewhat busy street, which is one lane in one direction and another lane in another direction. It is a main street for the area, but...
  4. Offroader

    What companies make the best / fastest electric mountain bikes?

    Someone asked me to find out what is a good and fast electric mountain bike. Maybe something with both pedals and a throttle. This would be for someone who is older but probably still wants to be able to do 30 MPH. Its really hard to find this out as there are so many companies. I personally...
  5. Offroader

    Need technical advice on how throttle controls motor power.

    I had some arguments about a nuclear controller I am using on another discussion forum specific to that controller. I had issues with how it was controlling the bike. I was right in my arguments but almost everybody seemed to not like what I was saying. I just can not understand why they are not...
  6. Offroader

    need advice on mud guard distance from rear tire?

    I'm trying to fit a mud guard over my rear tire. Would anyone know if it matters how close it sits above the tire? Is it usually a better idea to make it sit as close as possible above the rear tire to avoid spray from getting around the side edges? Is there any draw backs of it sitting too...
  7. Offroader

    Can someone help me find this connector

    This is used on the Sur-Ron bike to connect the 3 wire halls. This is the only picture I can find of the connector and wanted to see if I could find a match before dismantling my bike. If anyone has any idea or an idea on how I can search for it. Trying not to have to splice into wires...
  8. Offroader

    Funny or not funny, screeching rear tire to scare people?

    I'm putting this right in the toxic discussions because I don't know what kind of feedback I'll get on this. I don't know why I do this but I can't help myself. I have a 3" motorcycle tire on my rear that I keep at a low PSI, if I squeeze hard on my rear brake and at the same time use full...
  9. Offroader

    Can I use 18ga silicone wire as an 120volt AC extension cord?

    I'm planning a 6 month backpacking traveling trip to Asia. Most times I stay at hostels and it isn't easy to get power directly to my bed at many places to power my electronics. I am traveling ultra light with a small backpack. I need to make a 25 foot extension cord to always have power to my...
  10. Offroader

    advice for replacing bad cell in 3s2p 18650 pack.

    I madae these 3s2p packs, or 12 volt 18650 packs using 6 cells to power my laptop. I use two packs in series for 24 volts and that powers my dell notebook. I noticed one of the parallel groups or two cells is draining much lower than the others on one of the packs, like .2 volts with half use...
  11. Offroader

    200 volts DC to 12 volts DC converter question?

    This is for my hybrid car to power a dash cam when I'm not using the car. My battery voltage range is between 176 and 210 volts DC. Would I be able to use an AC 100-240V DC power adapter to 12 volts? Basically something like this, but its rated for AC, I heard it will work but I just wanted...
  12. Offroader

    Qulbix New high end mid-drive ebike

    Just got the Email from Qulbix about their new mid-drive. I have never considered a mid-drive due to the lower power and related drive train issues. I knew there will be a time when mid-drives were the only way to go for a performance bike and hub motors in the rear wheel became basically...
  13. Offroader

    Safe to charge lipo over 4.2 volts if resting voltage under 4.2?

    I have asked this question before and was told that I can charge lipo over 4.2 volts as long as the resting voltage is under 4.2 volts. For example, while charging a Lipo at a high rate the voltage will spike to maybe 4.25 volts under charge but when you stop charge the lipo will have a...
  14. Offroader

    Ebike hobby has increased my knowledge of electronics so much.

    I really knew nothing about electronics or circuit boards a few years ago before I had this hobby. Because I had to deal with so many issues, fixing controllers, electrical issues, building my own battery pack, etc., I've became a lot more knowledgeable about electronics. I practically knew...
  15. Offroader

    Running slightly different AMP hour cells in series question

    I'm building an electric car battery pack and this will use 84 20 amp hour cells. 24 of the 84 cells will have 1 amp hour higher in capacity. So 24 cells will be 21 amp hour and 60 cells will have 20 amp hour. Assume the 24 cells move perfectly together in balance, and the 60 cells move...
  16. Offroader

    Could someone help me figure out this HONDA BMS?

    This is from a Lithium titanate Honda FIT EV car. I have the 30 volt pack with attached BMS. The BMS doesn't seem to be doing anything, I charged and discharged cells by 1 amp hour and they just stay unbalanced. All cells were balanced by .002 when I opened the pack up. Some ideas: Does the...
  17. Offroader

    Thoughts on building an 18650 battery, expensive and complex

    Someone asked me some months back if I could build them an 18650 battery They offered to pay me for building but knowing how time consuming it is I declined. I also knew all the issues of sourcing the cells. I know some may have found 18650 cells for cheap but that is not always available...
  18. Offroader

    Best Hall sensor replacement part number

    I am planning on ordering some electronic parts and was wondering what is currently the best hall sensor replacement for ebike hubs. I know Honeywell was mentioned to be the best but wondering what is the exact part number. Thanks
  19. Offroader

    Can I wash a stator in water?

    Thinking of trying FF, but if it doesn't work as intended I would like to wash it out of the windings and stator and convert to air cooling so the dirt doesn't stick inside the windings from the outside air. Was wondering if anyone sees any issues with this? I guess I would remove the whole...
  20. Offroader

    How important is it for bearings to be easily turned?

    This is on a new MXUS turbo motor. One side the bearing is really smooth, with the cover off and spinning it on my finger it will spin for over 10 seconds by itself. The other side is more stiff, harder to turn, and will only spin for a second on my finger then stop. You can feel it is harder...
  21. Offroader

    Does anyone els have issues with aligning rear disc brakes?

    The fronts align very easily, but the rears are always an issue to get aligned. I usually spend a lot of time to get them aligned. One of the issues I see is that when I tighten the caliper down they move considerably in the rear. There must be a reason why the rears are so much harder than...
  22. Offroader

    Shake when spinning rear wheel off the ground

    I just built a new wheel with a new MXUS 3000 turbo motor and new tire. With the bike upside down and giving full throttle the rear tire spun with almost no shake at all. I've never felt such smoothness with my other cromotor builds and I've built a couple of them and used new tires also. I am...
  23. Offroader

    Confused about lifepo4 balancing?

    I've only used Lipo and lithium ion which are easily balanced and SOC determined by voltage. I was looking to build a large lifepo4 pack for my hybrid car and when testing a couple of lifepo4 cells I am learning that they do not behave like your typical lipo cell. I'm am concerned about using...
  24. Offroader

    Why are my cells in parallel when not connected in parallel?

    I built this pack and never connected the cells in parallel. Every two cells are connected in series to another 2 cells randomly in the next parallel group. When I check ohms between any cell in that parallel group (or the next parallel group connected with the series wires), it reads like 5-10...
  25. Offroader

    What battery for a ~8KW 160V car battery? recommendation.

    If you were going to build a large battery for a car in the 8-10KW size, what would you use? Assuming you wanted to make this not so costly. Also size is of a concern as there is not much room to put the battery in. Specs for the battery would be around 160volts, with at least 100 amp charge...
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